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以脱脂棉为模板,采用溶剂热法、超声法和浸渍法3种工艺,复制式制备了具有棉纤维结构的分级多孔SnO2纳米材料。通过X射线衍射、场发射扫描电子显微镜表征结果得知,3种方法制得的SnO2均为四方晶系金红石结构,均较好的复制了棉纤维的分级多孔结构。测试对比了SnO2材料制作的元件的气敏特性,3种元件对乙醇表现出很高的响应,其中浸渍法制备的材料显示出更高的响应,分析了生物模板在遗态材料合成过程中的作用,并初步分析了乙醇的气敏机理。
Taking absorbent cotton as a template, three kinds of processes of solvothermal method, ultrasonic method and impregnation method were used to prepare hierarchical porous SnO2 nanomaterials with cotton fiber structure. The results of X-ray diffraction and field emission scanning electron microscopy show that the SnO2 obtained by the three methods all have tetragonal rutile structure, and all of them have well-replicated the hierarchical porous structure of cotton fiber. The gas sensing properties of SnO2 material were compared. The three components showed high response to ethanol. The materials prepared by immersion method showed higher response. The biological templates were analyzed in the process of synthesis Role and preliminary analysis of the gas sensing mechanism of ethanol.